CVE-2026-6665

The SCRAM code in PgBouncer before 1.25.2 did not check the return value of strlcat() correctly when building the contents of the SCRAM client-final-message. A malicious backend that sends a SCRAM server-final-message with a long nonce can trigger a stack overflow.

Score

CVSS 3.1 9.8 Critical

Status

Analyzed - f86ef6dc-4d3a-42ad-8f28-e6d5547a5007

Published

2026-05-09

Last modified

2026-05-12

Weaknesses

CWE-121

Affected products

• Pgbouncer (Pgbouncer)

References

• https://www.pgbouncer.org/changelog.html#pgbouncer-125x